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Snailclimb merged 2 commits into from
Dec 6, 2019
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修改并增加关于CallerRunsPolicy策略描述 #574

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Merge pull request #1 from Snailclimb/master
zongzhang Nov 30, 2019
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修改并增加关于CallerRunsPolicy策略描述
zongzhang Nov 30, 2019
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4 changes: 2 additions & 2 deletions docs/java/Multithread/java线程池学习总结.md
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Expand Up @@ -172,7 +172,7 @@ public class ScheduledThreadPoolExecutor
如果当前同时运行的线程数量达到最大线程数量并且队列也已经被放满了任时，`ThreadPoolTaskExecutor` 定义一些策略:

- **`ThreadPoolExecutor.AbortPolicy`**：抛出 `RejectedExecutionException`来拒绝新任务的处理。
- **`ThreadPoolExecutor.CallerRunsPolicy`**：调用执行自己的线程运行任务。您不会任务请求。但是这种策略会降低对于新任务提交速度，影响程序的整体性能。另外，这个策略喜欢增加队列容量。如果您的应用程序可以承受此延迟并且你不能任务丢弃任何一个任务请求的话，你可以选择这个策略。
- **`ThreadPoolExecutor.CallerRunsPolicy`**：调用执行自己的线程运行任务，也就是直接在调用`execute`方法的线程中运行(`run`)被拒绝的任务，如果执行程序已关闭，则会丢弃该任务。因此这种策略会降低对于新任务提交速度，影响程序的整体性能。另外，这个策略喜欢增加队列容量。如果您的应用程序可以承受此延迟并且你不能任务丢弃任何一个任务请求的话，你可以选择这个策略。
- **`ThreadPoolExecutor.DiscardPolicy`：** 不处理新任务，直接丢弃掉。
- **`ThreadPoolExecutor.DiscardOldestPolicy`：** 此策略将丢弃最早的未处理的任务请求。

Expand Down Expand Up @@ -778,4 +778,4 @@ Wed Nov 13 13:40:43 CST 2019::pool-1-thread-5
## 九 其他推荐阅读

- [Java 并发（三）线程池原理](https://www.cnblogs.com/warehouse/p/10720781.html "Java并发（三）线程池原理")
- [如何优雅的使用和理解线程池](https://github.com/crossoverJie/JCSprout/blob/master/MD/ThreadPoolExecutor.md "如何优雅的使用和理解线程池")
- [如何优雅的使用和理解线程池](https://github.com/crossoverJie/JCSprout/blob/master/MD/ThreadPoolExecutor.md "如何优雅的使用和理解线程池")